Petit will make his next start in Colorado. He started in place of Tim Lincecum Thursday, and turned in a solid start. Petit has a 3.44 ERA over 86 1/3 innings.
Hernandez threw a bullpen session Friday, and is on pace to throw Monday. Hyun-Jin Ryu is expected to pitch Sunday.
Ryu has been working his back from a glute injury. He's been able to get through simulated games without any issues. Ryu has a 3.28 ERA over 137 1/3 innings.
Montero was involved in an incident in the minors Thursday night. He was supposed to begin a rehab assignment, but has been pulled from that assignment due to an altercation with a team employee. General manager Jack Zduriencik said Montero's season was over. The club's main focus is to get Montero to work out his personal issues.
Van Slyke is dealing with an ankle injury. He rolled his ankle Wednesday, and was removed from the game. X-rays came back negative on the injury, and Van Slyke shouldn't be out too long.
"He wants time to physically catch up...let's just see where we're at," manager Joe Girardi said, via the paper.